'Schlüsselblume' was a German and Croat unrealised operation against the partisan forces of Marshal Josip Broz Tito in the west of the Slavonia region of the puppet state of Croatia in German-occupied Yugoslavia (28 February/6 March 1944).

Intended as a major effort to destroy the estimated 25 partisan brigades operating in western Slavonia, 'Schlüsselblume' was not carried out as a result of the higher priority attached to the creation of forces for the 'Cannae' (iii) undertaking scheduled for 17 March.